Reload PageController funktioniert nicht

Question

Ich bin Daten aus dem Dienst wie folgt, aber Seitencontroller wird nicht aktualisiert.

- (void)viewWillAppear:(BOOL)animated 
{ 
    self.navigationController.navigationBar.hidden = YES; 
    self.nElements = [[NSMutableArray alloc] init]; 
    self.nTempElements = [[NSMutableArray alloc] init]; 
    [self loadFromURL]; 

    dispatch_async(dispatch_get_main_queue(), ^{ 
    [self.pageController setViewControllers:[NSArray arrayWithObject: 
              [self 
               viewControllerAtIndex:0]]    
       direction:UIPageViewControllerNavigationDirectionForward 
            animated:NO 
           completion:nil]; 
    }); 
} 

-(void)loadFromURL { 

    if([self.nElements count]){ 
     [self.nElements removeAllObjects]; 
    } 
    if([self.nTempElements count]){ 
     [self.nTempElements removeAllObjects]; 
    } 

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
    [manager GET:@"http://www.xxxxx.com.tr/api/news.json" parameters:nil progress: nil success:^(NSURLSessionTask * _Nonnull operation, id responseObject) { 
     if(responseObject != NULL) { 
      for (id jsonItem in [responseObject valueForKey:@"news"]) 
      { 
       MainNewsData *dicItem = [[MainNewsData alloc]initWithDictionary:jsonItem]; 
       [self.nElements addObject:dicItem]; 
       [self.nTempElements addObject:[jsonItem valueForKey:@"resim"]]; 
      } 
     } 


    } failure:^(NSURLSessionTask * _Nullable operation, NSError * _Nonnull error) { 

    }]; 
} 

Answer 1

Sie sollten Funktion in Main Thread als -Ganesh- genannten.

dispatch_async(dispatch_get_main_queue(), ^{ 
    [self.pageController setViewControllers:[NSArray arrayWithObject: 
              [self 
               viewControllerAtIndex:0]]    
       direction:UIPageViewControllerNavigationDirectionForward 
            animated:NO 
           completion:nil]; 
    });